overground

基本解释

When the roots become trees underground, the trees are also roots overground.
当根渐渐成了地下的树，树也就成了地上的根。
www.re-c.org
The Overground, a once grubby railway that crosses the Olympic site, has new infrastructure.
地面上，穿越奥林匹克场地的曾经肮脏的跌路已经被新的基础设施取代。
Because of the transaction costs, while engaging in economic activities people are faced with two alternatives: underground economy or overground economy.
由于交易成本的存在，使人们在进行经济活动时，面临着地上经济还是地下经济的选择。